BCAAs and lunges

1. Are BCAAs worth it for someone with a lot of weight to lose? I am also thinking of doing fasted lifting. Does that make a difference? I would do the BCAAs right before lifting.

2. When I do weighted lunges, I feel like I am not doing enough weight to sufficiently work my legs, but my arms feel like they are falling out. Is there a way to increase the stress on my legs without pulling my arms out of their sockets? I am using 35 pound dumbbells.

As for the BCAAs, how long after your workout are you breaking your fast? If you're eating shortly thereafter, I believe the recommendation would be to take them beforehand but not worry about taking them after. *Disclaimer: I'm not super familiar with them but have read a little bit about fasted workouts via Leangains.

I will try both barbell and a shoulder hold. After I recover from my shoulder injury. #sigh## I so want to ignore it and continue as normal, but I don't want it to be be the story I tell in ten years about why I can't use my arm. Until then, I guess I just do bodyweight lunges and squats, etc.